Electric incandescent lamp.



J. H. DALE. ELECTRIC INGANDESCENT LAMP.

APPLICATiON FlLED MAR` 5. \9\ 5\ Ptenma ,Imm 26, 1917.

III

UNITED STATES PATEN T1 OFFICE.

JOHN' H. DALE, OF NEW YORK, N. Y., ASSIGNOR T O DALE .LIGHTING FIXTURE CO., INC.,

"A CORPORATION 0F NEW YORK.

ELECTRIC IN CANDESCENT LAMP.

Application led March 5, 1915.

To all whom it may concern:

Be it known that I, JOHN H. DALE, a citizen of the United States, residing at the city of New York, in the borough ot Mann hatten and State of New York, have invented certain new and useful Improve ments in Electric Incandescent Lamps, of which the following is a full, clear, and exact description.

This invention relates to electric incandescent lamps and especially to a type of lamp which has been recently developed, and is lknown 'as the ,fnitrogen lamp, which is of Vintense brilliancy and high-candle power. The heat generated by such lamps is 'also very great, possibly due to the circulation of the nitrogen gas within the sealed bulb, the heat from the lament being carried to the lamp bulb by the gas and transmitted by conduction to the lam-p base in sullcient quantities to heat the latter to a. temperature considerably higher ,than that which is considered safe for installation. Fre quently the temperature to which the base is heated is. sufliciently high to take the temper from the spring contacts and other parts of the base and its connecting socket, as well as giving rise to other serious objections to the commercial use of lam s of this character,y It is the purpose oi this invention to prevent'orlcsscn the transmission of the .heat from the glass bulb to the base. and to thereby lowerthe temperature of the base.

4by n. space or chamber, an

To accomplish this, the inventioncontemplates a construction by. which the lamp base is separated from the fleck ofthe bulb yet the ,base is supported upon `the lempbulb in such a manner that the heat of the bulb cannot be transmitted directly by conduction to any material extentto the-'lamp base. This space is preferably -used to ventilate the lamp hase.

1' The invention also consists ofthe con structions and combinations which will he hereinafter setforth in le-tmlv and particularly pointed out in the appended claims,`

In theaccompanying drawings:

Figure l is@ .vieu partly in section and Specification of Letters Patent.

Patented June 26, 1.917.

Serial No. 12,298.

partly in elevation of my preferred einbodiment of a lamp;

Fig. 2 is a transverse section taken on the line 2-2 of Fig. l, looking in the direction of the arrows;

Fig. 3 is a detail of a modified form of structure; and

Fig. 4 is a detail of another modification.

One torni of lamp bulb with which the invention is adapted to be used is of the usual shape and size which has been adopted for nitrogen lamps and comprises a substantially spherical-shaped body portion 1 and au elongated cylindrical neck 2. Exteuding downwardly through the elongated neck 9. is a hollow post or stem 3 which is joined to the neck at the sealed bulb. The stem 3 carriesat its its upper en'd so'. as to form lower end a pedestal 4 from which the filament 5 is supported byV means of radiating arms 6. Current fis supplied to the filament by means of cppdiictoris 8 and 9, respectively,

which are of slitiicient cross section and rigidity to aid in sustaining the tilament in positio *These conductors pass through the ologed lower cud'of the hollow, post' 3 and the interior of thesame to the upper end of the 'neck 2.0i the lamp, and are adapgted to be connected to the lamp base. as .will be later referred to.

Tn the form of lamps shown in Figs. 1 and 3. the lamp base proper, which will be later described, is supported upon the lamp by means :.o'f. a skirt 10 which is similar to theoneused in the existing formspfqlitrogen lamp. and which is secured to the upper end of the neck by en "annular ring ot'` of cement. while being unaffected by the heat in the sense that it 'will not disintegrate or lose its adhesiveness under the action of heat. is not a heat insulator, and the heet of the bulb is transmitted to it so'that it reaches neck of the-lamp. This is due also to the fact that the lower end ot the skirt 10 is in direct contact with .the neck of the bulb.

The lamp base proper comprises a skirt 1Q. which has secured toit by means of the glass insulation 13, the usual screw plug 14.

' approximately the same temperature as the loe The skirt 12 is, however, 'of considerably larger diameter than the skirt 10, so that these two parts, when assembled, are separatedby a space or chamber 15. The skirt 12 is secured to the skirt 10 in the form as shown in Fig. 1, by means of a ring or Washer 16 of heat insulating material. The lower edges 17 and 18 of the skirts 10 and 12, respectively,v are bent around the bottom surface of this ring forming annular flanges while the portion of both the skirts adjacent the top face of the ring are swaged inwardly so as td provide a groove in. which' the ring of heat insulating material seats. The adjacent edges of the flanges 17 and 18 are not in contact so that the direct transmission of heat by conduction is prevented. Suitable ventilatin openings 19 are provided in the ring '16:1 ther ventilatin openings 20 are provided in the skirt 12 a jacent its connection to the screw plug, the openings in the ring and skirt being spaced but a slight distance apart so that a circular row of holes .is provided in each instance. The construction desdribed is suilicient to rigidly su port the lamp` base uponthe skirt 10.

he center contact 21 of the screw plug is secured to the conductor 8, while the conduc-4 tor Svis soldered or otherwise electrically connecfeted.tothe lower edge of the screw 'plug-1{1=in:the usual manner. In'` assembling thesepartsthe lamp base and ring 16 are secured -to'the'skirt 10 and the latter is thereafter secured tqthelam bulb, in the usual manner, and when the amp is lighted the cireulatlon-of the nitrogen gas within the lamp bulb, which* causes the neck of the bulb to become highly heated, will cause the skirt 10 to be heated to Aapproximately the same temperature; The radiation ofv heat from this surface causes the airwithin the annular chamber 15 to become heated, the heated air risi-ng 'in the chamber vnd vpassing out through the openings 20J "l leave a space l' or the cooler air surrounding pass 4into the annular chamber the lamp to being maintained until the lamp is again exprevented'by tbc interposition 'of the heat' Ainsulating ring betweenthe two skirts.

jcirculation of air in this manner, lowers the temperature of the skirt 12' of tinguished, and the parts becomevcool. The

therefore the'lamp base as well as 'the screw plug 14. The transmission of hea-t by conduction is through the` lopenings 19, .the circulation once established.

-be transmitted by conduction across the metallic Hangs 23but since there is apluralty of circular holes arranged within thls ange, thc conducting surface is reduced to a mini mum and a sufficient quantity of heat cannot be conducted in this manner to cause a heatin of the skirt 12 to a high. temperature..

Vhile I deem the form of lamp base with theyentilated passages as shown in Figs. 1 and' 3 of the d sawing to be the preferred embodiment oil my invention, yet theconstruction which is shown in Fig. 4 may be used'. In this construction, as before, the metallic skirt 10 is cemented to the neck of the lamp bulb by a layer of cement 11.

The lamp base in this form comprises the usual screw lug 14 which is mounted and secured in pliice upon a skirt by means of glass insulation-13 as previously described. The skirt, however, in this form. is cut away so as to provide an annular hub 27 upon which the screw plug rests, and a plurality of ribs 26 which are preferably three in number, although a greater or less number may be used. These ribs are connected to. the metallic skirt which is rigidly'secured to the neck of the vbulb by connecting-pieces 26. The plug 14 ofthe base, while rigidly supported by the lamp bulb, is nevertheless out of direct contact with the neck of the bulb and is spaced a considerable distance therefrom so that it will remain practically.

unaffected by the heat' radiating fromthe lamp bulb which heat dissipates into the surrounding air. Moreover,"suicient heat cannot be transmitted by conduction over the.

metallic pieces 26 and ribs 26 to heat the screw plug tg) any material extent;`

While I .ve shown several modifications of the inve tion, yet it is apparent that still further modifications and ramifications may be produed and it is not my intention to be limited tofthe specific embodiment shown,

since Idcem a construction in which thel` f.-

lamp base, while being separated from he ,lamp bulbto provide a. heat insulating -z me;

between the two, is rigidly .supportedgth re.

to be limitedonly by the scope pt the i ppended claims. I'claim: 1, 1. An electric incandescent lampcomprls- "by, to be novel with me, and hence I de ire.;

ing a lamp bulb having a neck, a metallie'- part rigidly secure-d on the end 0f Baidneclg a lamp base comprising a screw plug and a.

skirt, auf] moans connecting sald metallic part to said ski-1t arid supporting .the latten with a Ventilating space between said Skirt and tbe metallic part. t; .1.

2. An electric incandescent-lampcomprising a lamp bulb having a neclna ring. rigidly secured to said neck, a lamp base .consisting ,of a screw plul and4 a skirt, an annulant-*ing connecti ng sai skirt and ring and support,-

ing them with espace between the two, said anl'lular ring and skirt having Ventilating and skirt having Ventilating openings 10 openings therein. therein.

3. An electric incandescent lamp compris- In witness whereof, I subscribe my signaing a ldnmp bug) havking neckaring rigidly ture, in. the presence of two witnesses. secure to sai nec a. amp ase consistin of a Screw plug andas. skirt, an annular ring` JOHN H' DALE of heat insulating material connecting said Witnesses: skirt and ring and supporting them with a WALDO M. CHAPIN, space `between the two, said annular ring JOSEPH A. BUCKLE. 1 

